Interesting thinking and "Imagine Stonehenge restored, with three concentric rings of stone. A prison of stone, open only to a circle of blank sky" is very true having been inside 'foamhenge' - it felt almost cozy, or certainly incredibly enclosed.

Not sure how well it applies to the majority of stone circles tho. Remember Stonehenge is the oddball.

Surely the vast majority 'feel' very open - esp those (most?) that are built on hillsides/tops & on open stretches of moorland - Ilkley 12 Apostles, Greenland (Falls of Acharn), nearly all the Aberdeenshire circles, Penmaenmawr Druid's Circle, Scorhill, Boskednen Nine Maidens and the list could go on and on and on to cover the whole of the UK.

love

Moth